Close friends or even a counselor are usually the people we go to when we have endured a tough break up.
The question asked is usually, "How do I get my ex girlfriend back?" desperately hoping to hear a magic answer or super cure to fix all the problems and make their ex girlfriend come crawling back.
Is this person you?  If so; you are completely the same as me and have every right to feel such emotions.
 I completely understand that you have invested not only time and effort into a relationship; it would be a huge loss if you just let your ex girlfriend leave.
My first piece of advice would just to give you both some breathing space by having some time apart; This really means you must try your utmost to keep away and avoid calling her and also means no swinging by and dropping by his place.
 The worst thing you could possibly do is show that you can't go on another day without her; this could lead to a permanent break up.
  Your time is better off spent with family and friends than endlessly checking your phone; Go enjoy yourself.
 Go with a bunch of friends to watch the game, have a few beers and enjoy yourself.
As soon as you ex sees you enjoying life so much without her; its going to stir some curiosity and deep regret in her stomach.
 Being unfazed would really take her by surprise and catch her off guard, she will want to win you back for sure.
 When he starts calling you; you'll realize that the most worthy question to ask is "how do I get my ex girlfriend back?"